[hidden] { display: none !important; }
/* Ductus Atlas: styles for the deep layer (nav, lenses, meanwhile, practice, quiz, terms). Tokens live in styles.css. */
.btn {
  border: 1px solid var(--ink); background: var(--ink); color: var(--paper);
  padding: 9px 16px; font-size: 0.86rem; cursor: pointer;
}
.btn:hover { background: var(--ink-2); border-color: var(--ink-2); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--rule); }
.btn.ghost:hover { border-color: var(--ink); }

.theme-toggle {
  position: fixed; bottom: 14px; left: 14px; z-index: 30;
  border: 1px solid var(--rule); background: var(--sheet); color: var(--ink-2);
  padding: 6px 12px; font: 500 0.7rem/1.3 var(--f-data); text-transform: uppercase; letter-spacing: 0.08em;
  cursor: pointer; border-radius: 999px;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink); }

.tree-scroll { position: relative; }
.tree-tip {
  position: absolute; z-index: 6; width: 260px; display: grid; gap: 10px; padding: 14px 16px;
  background: var(--sheet); border: 1px solid var(--rule); box-shadow: 0 8px 24px rgb(0 0 0 / 0.18);
}
.tree-tip-head { display: flex; align-items: baseline; gap: 8px; }
.tree-tip-head span { font: 400 0.72rem var(--f-data); color: var(--ink-2); }
.tree-tip-close { margin-left: auto; border: 0; background: none; cursor: pointer; color: var(--ink-2); font-size: 1.1rem; line-height: 1; }
.tree-tip-close:hover { color: var(--ink); }
.tree-tip p { font-size: 0.88rem; color: var(--ink-2); }
.tree-tip .go { justify-self: start; }

.learn-panel { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--rule); display: grid; gap: 16px; }
.learn-level { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; }
.learn-level b { font: 400 1.5rem/1.2 var(--f-display); color: var(--ink); }
.learn-why { font-size: 0.88rem; color: var(--ink-2); }
.learn-stats { margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px 20px; }
.learn-stats div { display: grid; gap: 2px; }
.learn-stats dt { font: 500 0.66rem/1.3 var(--f-data); text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-2); }
.learn-stats dd { margin: 0; font: 400 1.15rem/1.2 var(--f-display); color: var(--ink); }
.learn-actions { display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center; }
.learn-actions button[disabled] { opacity: 0.45; cursor: default; }
.page > section + section { scroll-margin-top: 64px; }
#atlas, #meanwhile, #parallels, #measure, #practice, #quiz-section, #terms, #today { scroll-margin-top: 64px; }

/* ── Contents bar ─────────────────────────────── */
.contents {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  display: flex; gap: 4px 18px; flex-wrap: nowrap; overflow-x: auto;
  margin: -24px 0 40px; padding: 10px 0;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  font: 500 0.74rem/1.3 var(--f-data); text-transform: uppercase; letter-spacing: 0.1em;
  scrollbar-width: none;
  -webkit-mask-image: linear-gradient(to right, transparent, black 24px, black calc(100% - 24px), transparent);
  mask-image: linear-gradient(to right, transparent, black 24px, black calc(100% - 24px), transparent);
}
.contents a { color: var(--ink-2); text-decoration: none; white-space: nowrap; padding: 5px 0 4px; border-bottom: 2px solid transparent; }
.contents a:hover { color: var(--ink); }
.contents a.is-active { color: var(--ink); font-weight: 600; border-bottom-color: var(--ink); }

/* ── Lens banner on the timeline ──────────────── */
.lens-banner {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px 16px;
  padding: 10px 14px; margin-bottom: 12px;
  border: 1px solid var(--ink); background: var(--sheet); font-size: 0.9rem;
}
.lens-banner b { font-weight: 600; }
.node.is-lens { box-shadow: 0 0 0 1px var(--c), 0 0 0 4px var(--sheet), 0 0 0 5.5px var(--ink); }
.node.is-lens + .node-label { opacity: 1; color: var(--ink); }

/* ── Meanwhile ────────────────────────────────── */
.meanwhile, .parallels, .practice, .quiz-section, .terms { margin-top: clamp(24px, 4vw, 40px); }
.mw-controls { display: grid; grid-template-columns: minmax(0, auto) minmax(0, 1fr); gap: 12px 32px; align-items: end; margin-bottom: 20px; }
.mw-year { font: 400 clamp(2.6rem, 6vw, 4.2rem)/1 var(--f-display); font-style: italic; min-width: 5ch; font-variant-numeric: tabular-nums; }
.mw-slider { display: grid; gap: 6px; }
.mw-slider input { width: 100%; accent-color: var(--ink); }
.mw-presets { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 6px; }
.mw-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.mw-cell { background: var(--sheet); padding: 14px 16px 16px; display: grid; gap: 8px; align-content: start; min-width: 0; }
.mw-now {
  display: grid; grid-template-columns: 10px minmax(0, 1fr); gap: 2px 8px; align-items: baseline;
  text-align: left; border: 0; background: none; padding: 0; cursor: pointer;
}
.mw-now i { width: 9px; height: 9px; border-radius: 50%; background: var(--c); grid-row: 1; transform: translateY(-1px); }
.mw-now b { font: 500 1.2rem/1.15 var(--f-display); }
.mw-now span { grid-column: 2; font: 400 0.7rem/1.4 var(--f-data); color: var(--ink-2); }
.mw-now:hover b { text-decoration: underline; text-decoration-color: var(--c); text-underline-offset: 3px; }
.mw-empty, .mw-next { font-size: 0.8rem; color: var(--ink-2); }
.mw-next { border-top: 1px solid var(--rule-soft); padding-top: 8px; }

/* ── Parallels ────────────────────────────────── */
.kind {
  display: inline-block; font: 500 0.62rem/1 var(--f-data); text-transform: uppercase; letter-spacing: 0.12em;
  padding: 4px 6px; border: 1px solid currentColor; margin-right: 8px; vertical-align: 2px;
}
.kind-contact { color: var(--t-reed); }
.kind-parallel { color: var(--t-carved); }
.lens-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.lens-tab {
  border: 1px solid var(--rule); background: var(--sheet); cursor: pointer;
  padding: 8px 12px; font-size: 0.84rem; text-align: left;
}
.lens-tab[aria-selected="true"] { border-color: var(--ink); box-shadow: inset 0 -2px 0 var(--ink); }
.lens-panel { border-top: 1px solid var(--ink); padding-top: 24px; display: grid; gap: 24px; }
.lens-head { display: grid; gap: 8px; justify-items: start; }
.lens-head h3 { font-size: clamp(1.8rem, 3.6vw, 2.5rem); line-height: 1.05; }
.lens-thesis { font-size: 1.05rem; max-width: 62ch; }
.mini-axis { position: relative; height: 84px; margin-inline: 4px; }
.mini-rule { position: absolute; left: 0; right: 0; top: 42px; border-top: 1px solid var(--ink-2); }
.mini-mark { position: absolute; top: 42px; transform: translateX(-50%); }
.mini-mark i { position: absolute; left: 50%; width: 12px; height: 12px; margin: -6px 0 0 -6px; border-radius: 50%; background: var(--c); border: 2px solid var(--paper); }
.mini-mark span { position: absolute; left: 50%; transform: translateX(-50%); white-space: nowrap; font: 400 0.66rem/1 var(--f-data); color: var(--ink-2); }
.mini-mark.up span { bottom: 14px; }
.mini-mark.down span { top: 12px; }
.mini-mark::after { content: ""; position: absolute; left: 50%; height: 8px; border-left: 1px solid var(--rule); }
.mini-mark.up::after { bottom: 6px; } .mini-mark.down::after { top: 6px; }
.mini-end { position: absolute; top: 48px; font: 400 0.6rem/1 var(--f-data); color: var(--ink-2); opacity: 0.8; }
.mini-end.l { left: 0; } .mini-end.r { right: 0; }
.lens-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.lens-card { display: grid; gap: 8px; align-content: start; padding-top: 12px; border-top: 3px solid var(--c); min-width: 0; }
.lens-card h4 { margin: 0; font: 500 1.35rem/1.1 var(--f-display); }
.lens-card p { font-size: 0.9rem; color: var(--ink-2); }
.lens-card .go { justify-self: start; font-size: 0.8rem; }
.lens-insight { font: 400 clamp(1.15rem, 2vw, 1.35rem)/1.45 var(--f-display); font-style: italic; max-width: 60ch; }

/* ── Practice desk ────────────────────────────── */
.desk { display: grid; grid-template-columns: minmax(0, 17rem) minmax(0, 1fr); gap: 24px; align-items: start; }
.desk-side { display: grid; gap: 12px; min-width: 0; }
.drills { display: grid; gap: 4px; }
.drill {
  display: flex; align-items: center; gap: 10px; text-align: left; cursor: pointer;
  border: 1px solid transparent; background: none; padding: 8px 10px; font-size: 0.9rem;
}
.drill i, .desk-tools i { width: 9px; height: 9px; border-radius: 50%; background: var(--c); flex: none; }
.drill:hover { border-color: var(--rule); }
.drill[aria-pressed="true"] { border-color: var(--ink); background: var(--sheet); }
.desk-brief { border-top: 1px solid var(--rule); padding-top: 14px; display: grid; gap: 10px; }
.desk-brief h3 { font-size: 1.5rem; line-height: 1.1; }
.desk-brief p { font-size: 0.9rem; }
.yong { margin: 0; padding-left: 1.4em; display: grid; gap: 2px; font-size: 0.84rem; color: var(--ink-2); }
.yong b { color: var(--ink); font-weight: 600; margin-right: 4px; }
.desk-main { display: grid; gap: 12px; min-width: 0; }
.desk-tools { display: flex; flex-wrap: wrap; gap: 6px; }
.desk-tools button {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  border: 1px solid var(--rule); background: var(--sheet); padding: 7px 12px; font-size: 0.84rem;
}
.desk-tools button[aria-pressed="true"] { border-color: var(--ink); box-shadow: inset 0 -2px 0 var(--c); }
.desk-canvas {
  display: block; width: 100%; max-width: 100%; aspect-ratio: 2 / 1;
  border: 1px solid var(--rule); border-bottom: 3px solid var(--c, var(--ink));
  background: var(--sheet); touch-action: none; cursor: crosshair;
}
.desk-controls { display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center; font-size: 0.84rem; }
.desk-controls label { display: inline-flex; align-items: center; gap: 8px; }
.desk-controls input[type="range"] { width: 110px; accent-color: var(--ink); }
.desk-controls output { font: 400 0.74rem var(--f-data); color: var(--ink-2); min-width: 3ch; font-variant-numeric: tabular-nums; }
.desk-buttons { display: inline-flex; gap: 6px; margin-left: auto; }

/* ── Quiz ─────────────────────────────────────── */
.chip[aria-pressed="true"][data-mode] { border-color: var(--ink); box-shadow: inset 0 -2px 0 var(--ink); }
.quiz { max-width: 44rem; }
.q-bar { display: flex; justify-content: space-between; gap: 12px; font: 400 0.72rem var(--f-data); color: var(--ink-2); padding-bottom: 8px; border-bottom: 1px solid var(--rule); font-variant-numeric: tabular-nums; }
.q-card { padding-block: 22px; display: grid; gap: 16px; }
.q-spec { font-size: clamp(3rem, 10vw, 5rem); line-height: 1.2; min-height: 1.3em; overflow-wrap: anywhere; }
.q-spec.f-nastaliq { font-size: clamp(2.2rem, 7vw, 3.4rem); line-height: 1.8; }
.q-kicker { font: 500 0.7rem var(--f-data); text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-2); }
.q-name { font: 500 clamp(1.8rem, 4vw, 2.4rem)/1.1 var(--f-display); }
.q-ask { font-size: 0.95rem; color: var(--ink-2); }
.q-opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 8px; }
.q-opts.two { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.q-opt {
  display: flex; align-items: center; gap: 10px; text-align: left; cursor: pointer;
  border: 1px solid var(--rule); background: var(--sheet); padding: 12px 14px; font-size: 0.92rem; min-width: 0;
}
.q-opt.pair { flex-direction: column; align-items: flex-start; gap: 4px; padding: 16px; }
.q-opt.pair span { font: 500 1.25rem/1.15 var(--f-display); }
.q-opt small { font: 400 0.68rem var(--f-data); color: var(--ink-2); text-transform: uppercase; letter-spacing: 0.08em; }
.q-opt i { width: 9px; height: 9px; border-radius: 50%; background: var(--c); flex: none; }
.q-opt:hover:not(:disabled) { border-color: var(--ink); }
.q-opt:disabled { cursor: default; }
.q-opt.right { border-color: var(--t-quill); box-shadow: inset 0 0 0 1px var(--t-quill); }
.q-opt.wrong { border-color: var(--t-brush); opacity: 0.7; text-decoration: line-through; text-decoration-color: var(--t-brush); }
.q-feedback:empty { display: none; }
.q-feedback { display: grid; gap: 12px; border-top: 1px solid var(--rule-soft); padding-top: 14px; font-size: 0.95rem; }
.q-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.q-done { gap: 10px; }
.q-score { font: 400 clamp(3.2rem, 8vw, 5rem)/1 var(--f-display); font-variant-numeric: tabular-nums; }
.q-score span { font-size: 0.45em; color: var(--ink-2); }

/* ── Terms ────────────────────────────────────── */
.glossary { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 0 32px; margin: 0; }
.term { padding-block: 14px; border-top: 1px solid var(--rule); }
.term dt { font: 500 1.2rem/1.2 var(--f-display); display: grid; gap: 2px; }
.term dt .kicker { font-size: 0.6rem; order: -1; }
.term dd { margin: 6px 0 0; font-size: 0.88rem; color: var(--ink-2); max-width: 60ch; }

@media (max-width: 860px) {
  .desk { grid-template-columns: minmax(0, 1fr); }
  .drills { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
}
@media (max-width: 560px) {
  .mw-controls { grid-template-columns: minmax(0, 1fr); }
  .desk-buttons { margin-left: 0; }
}

.era3d { margin: 0 0 24px; display: block; min-width: 0; max-width: 100%; }
.era3d > * + * { margin-top: 8px; }
.era3d-stage { position: relative; width: 100%; height: 460px; background: var(--sheet); border: 1px solid var(--rule); overflow: hidden; }
.era3d-stage { min-width: 0; max-width: 100%; }
.era3d-stage canvas { display: block; width: 100% !important; max-width: 100%; height: 460px; cursor: grab; }
.era3d-caption { font: 500 0.82rem/1.4 var(--f-data); color: var(--ink-2); letter-spacing: 0.02em; }

@media (max-width: 760px) {
  .theme-toggle { left: auto; right: 10px; bottom: 10px; padding: 4px 9px; font-size: 0.62rem; background: color-mix(in srgb, var(--sheet) 92%, transparent); }
}